Flaw in OpenShift Router Allows Sensitive Data Disclosure
CVE-2026-42965

7.7HIGH

Key Information:

Vendor: Red Hat
Status: Red Hat Openshift Container Platform 4.17; Red Hat Openshift Container Platform 4.18; Red Hat Openshift Container Platform 4.19; Red Hat Openshift Container Platform 4.20
Vendor: CVE Published:; 29 May 2026

What is CVE-2026-42965?

A security flaw has been identified in the OpenShift Router, where users with EndpointSlice write access can exploit the system. This vulnerability allows an attacker to create a service backed by an FQDN EndpointSlice that resolves to a cloud metadata endpoint. By doing so, it becomes possible for the router to proxy requests to this endpoint, potentially leading to the disclosure of sensitive instance credentials and metadata. This incident bypasses existing security measures designed to validate IP addresses, posing a significant risk to user data.